Direct synthesis of poly(l-lactic acid) in supercritical carbon dioxide with dicyclohexyldimethylcarbodiimide and 4-dimethylaminopyridine
β Scribed by Satoshi Yoda; Daniel Bratton; Steven M. Howdle
- Book ID
- 108247884
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 269 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0032-3861
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π SIMILAR VOLUMES
## Abstract Starting from D,Lβacid and SnCl~2~ as catalyst, poly(D,Lβlactic acid) (PDLLA) was directly synthesized by melt polycondensation. Under the appropriate conditions such as 0.5 wt % SnCl~2~, 170β180Β°C, 70 Pa, and 10 h, the viscosityβaverage molecular weight (__M__~Ξ·~) of PDLLA was 4100 Da.
## Abstract The sorption of carbon dioxide in glassy Poly(lactic acid) (PLA) films was studied by quartz crystal microbalance (QCM) at high pressures. Two thermal treatments, melted and quenched, were performed in PLA with two different __L__:__D__ contents, 80:20 and 98:2, films and compared with